Tham khảo tài liệu 'professional information technology-programming book part 42', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | keys Cmd Ctrl-J. This is the routine to re-size sharpen and match noise for the image in Figure 927 Figure 9-27. The Transform command used to cast the shadow as the light from the front of the tunnel would cast it. 1. Open the background and knockout images at the same time. Cut and copy the knockout image s layer then Paste it into the background image where it becomes a new layer. 2. Free Transform Cmd Ctrl-T the knockout to fit the size angle and perspective you want it to have. Ideally you should have to reduce its size or keep it the same size rather than enlarge it. 3. Create the shadow duplicate the layer and then drag it below the original. This is going to be the Shadow layer. Lock the layer s transparency by clicking the Transparency Lock icon near the top of the palette. Choose Edit Fill Black. You now have a black silhouette of your knockout. 4. Now transform the shadow silhouette layer so that the shape of the truck is projected away from the source of the light. In this particular shot the light source has to be behind us because the truck is in a tunnel that s lit by sunlight. You can see how I shaped the Transform marquee in Figure 9-27. 5. Make a gradient selection for the entire image. This is going to allow you to make a shadow that becomes more diffuse as it recedes from the light source. To do this go to the Channels palette and click the New Channel Icon. A black channel named Alpha 1 will appear. Rename it Truck Shadow. Now choose the Gradient fill tool a rectangular fill and a black to white gradient. Fill the channel with the black to white gradient spreading the gradient portion as far as possible. 6. Return to the Shadow Layer and turn off all the other layers so that you can clearly see what you re doing. Choose Select Load Selection. In the Load Selection dialog choose Truck Shadow or whatever you ve called the layer and channel you re turning into a shadow . Drag the resultant marquee so that its lower line which happens to be the .
